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https://issues.apache.org/jira/browse/ZOOKEEPER-3352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814023#comment-16814023
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Michael Han commented on ZOOKEEPER-3352:
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I don't see an obvious gain of using a LSM tree backend just for snapshot and
txn log. For zk clients, the read path will be served directly from memory
(think zk data tree as a 'memtable' that never flushes); the write path is
already sequential for both snapshot and txn log. Reading snapshot and txn log
out of LSM tree instead of flat files might reduce recovery time, but I doubt
the difference is substantial.
That said, having a LSM tree backend and build the zk data tree on top of it
will make it possible to store a much larger scale of data set per single node,
as we will not store all data in memory only.
> Use LevelDB For Backend
> -----------------------
>
> Key: ZOOKEEPER-3352
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3352
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Major
> Fix For: 4.0.0
>
>
> Use LevelDB for managing data stored in ZK (transaction logs and snapshots).
> https://stackoverflow.com/questions/6779669/does-leveldb-support-java
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